package com.sky.service.impl;

import com.sky.constant.MessageConstant;
import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Dish;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;

import lombok.extern.slf4j.Slf4j;
import nonapi.io.github.classgraph.utils.Join;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) throws Exception {
        if (begin.isAfter(end)){
            throw new Exception(MessageConstant.UNKNOWN_ERROR);
        }
        //获取每一天的日期
        List<LocalDate> dateList = getDateList(begin, end);
        String dateListString = StringUtils.join(dateList, ",");

        List<Double> turnoverList = new ArrayList<>();
        //获取每一天的营业额
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);

            //select sum(amount) from orders where order_time > beginTime and order_time < endTime and status = 5
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        String turnoverListString = StringUtils.join(turnoverList,",");

        //封装返回
        TurnoverReportVO turnoverReportVO = new TurnoverReportVO();
        turnoverReportVO.setDateList(dateListString);
        turnoverReportVO.setTurnoverList(turnoverListString);
        return turnoverReportVO;
    }


    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO userStatistics(LocalDate begin, LocalDate end) {
        //获取每一天的日期
        List<LocalDate> dateList = getDateList(begin, end);
        String dateListString = StringUtils.join(dateList, ",");

        //获取新用户
        List<Integer> newUserList = new ArrayList();
        //获取总用户
        List<Integer> totalUserList = new ArrayList();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);

            Map map = new HashMap();
            map.put("end",endTime);
            //总用户
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin",beginTime);
            //新用户
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }


        String newUserListString = StringUtils.join(newUserList, ",");
        String totalUserListString = StringUtils.join(totalUserList, ",");

        UserReportVO userReportVO = new UserReportVO();
        userReportVO.setDateList(dateListString);
        userReportVO.setNewUserList(newUserListString);
        userReportVO.setTotalUserList(totalUserListString);
        return userReportVO;
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = getDateList(begin, end);
        String dateListString = StringUtils.join(dateList, ",");

        List<Integer> orderCountList = new ArrayList();
        List<Integer> validOrderCountList = new ArrayList();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            //总订单数
            Integer orderCount = orderMapper.countByMap(map);
            //有效订单数
            map.put("status", Orders.COMPLETED);
            Integer validOrderCount = orderMapper.countByMap(map);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        String orderCountListString = StringUtils.join(orderCountList, ",");
        String validOrderCountListString = StringUtils.join(validOrderCountList, ",");

        //总订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(dateListString)
                .orderCountList(orderCountListString)
                .validOrderCountList(validOrderCountListString)
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量排名
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    //获取每一天的日期
    private static List<LocalDate> getDateList(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        return dateList;
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //查询数据库
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);

        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);

        BusinessDataVO businessDataVO = workspaceService.getBusinessData(beginTime,endTime);
        //POI写入文档
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template\\运营数据报表模板.xlsx");

        try {
            //基于模板创建Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //填充数据
            XSSFSheet sheet = excel.getSheet("Sheet1");

            sheet.getRow(2).getCell(1).setCellValue("日期："+begin+"至"+end);

            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                //查询每一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                row = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

        //输出流服务器下载
            OutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }



    }

}

